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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 134 |
| 4 | 167 |
| 5 | 2239 |
| 6 | 62268 |
| 7 | 75255 |
| 8 | 135681 |
| 9 | 439867 |
| 10 | 18139940 |
| 11 | 23671044 |
| 12 | 40892256 |
| 13 | 312083956 |
| 14 | 724031017 |
| 15 | 1990127567 |
| 16 | 2144843867 |
| 17 | 2588619526 |
| 18 | 7439533243 |
| 19 | 15054156002 |
| 20 | 54892225873 |
| 21 | 69959798320 |
| 22 | 79760490898 |
| 23 | 282311798922 |
[2,13,134,167,2239,62268,75255,135681,439867, 18139940,23671044,40892256,312083956,724031017, 1990127567,2144843867,2588619526,7439533243, 15054156002,54892225873,69959798320,79760490898, 282311798922] |